ftp.ntua.gr:/ubuntu/dists/focal-security/main/signed/linux-gcp-amd64/current/?C=N&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] signed.tar.gz                                    12-May-2021 12:19   18M  
[   ] SHA256SUMS.gpg                                   12-May-2021 12:19  1.5K  
[   ] SHA256SUMS                                       12-May-2021 12:19   80
Apache/2.2 Server at ftp.ntua.gr Port 80